[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 80.053542][ T30] audit: type=1800 audit(1566793095.096:25): pid=11799 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 80.080461][ T30] audit: type=1800 audit(1566793095.126:26): pid=11799 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 80.115419][ T30] audit: type=1800 audit(1566793095.156:27): pid=11799 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.188' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 93.087356][T11951] IPVS: ftp: loaded support on port[0] = 21 [ 93.393868][ T12] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 93.633852][ T12] usb 1-1: Using ep0 maxpacket: 16 [ 93.754001][ T12] usb 1-1: config 0 has an invalid interface number: 234 but max is 0 [ 93.762224][ T12] usb 1-1: config 0 has no interface number 0 [ 93.768521][ T12] usb 1-1: config 0 interface 234 altsetting 0 endpoint 0x8D has an invalid bInterval 255, changing to 11 [ 93.779986][ T12] usb 1-1: config 0 interface 234 altsetting 0 endpoint 0x7 has invalid maxpacket 1843, setting to 1024 [ 93.791246][ T12] usb 1-1: config 0 interface 234 altsetting 0 bulk endpoint 0x7 has invalid maxpacket 1024 [ 93.801464][ T12] usb 1-1: config 0 interface 234 altsetting 0 bulk endpoint 0x8F has invalid maxpacket 0 [ 93.811537][ T12] usb 1-1: New USB device found, idVendor=0421, idProduct=0486, bcdDevice=14.d7 [ 93.820750][ T12] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 93.830603][ T12] usb 1-1: config 0 descriptor?? [ 93.876602][ T12] rndis_wlan 1-1:0.234: invalid descriptor buffer length [ 93.883885][ T12] usb 1-1: bad CDC descriptors [ 93.890158][ T12] rndis_host 1-1:0.234: invalid descriptor buffer length [ 93.897518][ T12] usb 1-1: bad CDC descriptors [ 93.903003][ T12] cdc_acm 1-1:0.234: invalid descriptor buffer length [ 93.909897][ T12] cdc_acm 1-1:0.234: No union descriptor, testing for castrated device [ 93.918620][ T12] cdc_acm: probe of 1-1:0.234 failed with error -12 [ 94.078377][ T49] usb 1-1: USB disconnect, device number 2 [ 94.085735][ T49] ================================================================== [ 94.093835][ T49] BUG: KMSAN: uninit-value in device_release_driver_internal+0x5ee/0xd20 [ 94.102365][ T49] CPU: 1 PID: 49 Comm: kworker/1:1 Not tainted 5.3.0-rc3+ #17 [ 94.109836][ T49] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.119889][ T49] Workqueue: usb_hub_wq hub_event [ 94.124907][ T49] Call Trace: [ 94.128189][ T49] dump_stack+0x191/0x1f0 [ 94.132525][ T49] kmsan_report+0x162/0x2d0 [ 94.137021][ T49] __msan_warning+0x75/0xe0 [ 94.141517][ T49] device_release_driver_internal+0x5ee/0xd20 [ 94.147659][ T49] device_release_driver+0x4b/0x60 [ 94.152752][ T49] bus_remove_device+0x4bf/0x670 [ 94.157793][ T49] device_del+0xcd5/0x1d10 [ 94.162216][ T49] usb_disable_device+0x567/0x1150 [ 94.167432][ T49] usb_disconnect+0x51e/0xd60 [ 94.172106][ T49] hub_event+0x3fd0/0x72f0 [ 94.176513][ T49] ? rlb_choose_channel+0x1409/0x1d10 [ 94.181879][ T49] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 94.187950][ T49] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 94.193997][ T49] ? led_work+0x720/0x720 [ 94.198306][ T49] ? led_work+0x720/0x720 [ 94.202621][ T49] process_one_work+0x1572/0x1ef0 [ 94.207640][ T49] worker_thread+0x111b/0x2460 [ 94.212399][ T49] kthread+0x4b5/0x4f0 [ 94.216647][ T49] ? process_one_work+0x1ef0/0x1ef0 [ 94.221922][ T49] ? kthread_blkcg+0xf0/0xf0 [ 94.226520][ T49] ret_from_fork+0x35/0x40 [ 94.230956][ T49] [ 94.233274][ T49] Uninit was created at: [ 94.237526][ T49] kmsan_internal_poison_shadow+0x53/0xa0 [ 94.243398][ T49] kmsan_slab_free+0x8d/0x100 [ 94.248055][ T49] kfree+0x4c1/0x2db0 [ 94.253680][ T49] usb_release_interface+0x105/0x120 [ 94.259229][ T49] device_release+0xe2/0x380 [ 94.263807][ T49] kobject_put+0x38d/0x480 [ 94.268206][ T49] put_device+0x51/0x70 [ 94.272337][ T49] klist_devices_put+0x50/0x70 [ 94.277095][ T49] klist_del+0x1fe/0x2f0 [ 94.281351][ T49] bus_remove_device+0x4a0/0x670 [ 94.286375][ T49] device_del+0xcd5/0x1d10 [ 94.290772][ T49] usb_disable_device+0x567/0x1150 [ 94.295864][ T49] usb_disconnect+0x51e/0xd60 [ 94.300528][ T49] hub_event+0x3fd0/0x72f0 [ 94.304929][ T49] process_one_work+0x1572/0x1ef0 [ 94.310793][ T49] worker_thread+0x111b/0x2460 [ 94.315542][ T49] kthread+0x4b5/0x4f0 [ 94.319586][ T49] ret_from_fork+0x35/0x40 [ 94.323972][ T49] ================================================================== [ 94.332028][ T49] Disabling lock debugging due to kernel taint [ 94.338202][ T49] Kernel panic - not syncing: panic_on_warn set ... [ 94.344772][ T49] CPU: 1 PID: 49 Comm: kworker/1:1 Tainted: G B 5.3.0-rc3+ #17 [ 94.353594][ T49] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.363786][ T49] Workqueue: usb_hub_wq hub_event [ 94.368804][ T49] Call Trace: [ 94.372086][ T49] dump_stack+0x191/0x1f0 [ 94.376401][ T49] panic+0x3c9/0xc1e [ 94.380289][ T49] kmsan_report+0x2ca/0x2d0 [ 94.384773][ T49] __msan_warning+0x75/0xe0 [ 94.389285][ T49] device_release_driver_internal+0x5ee/0xd20 [ 94.395375][ T49] device_release_driver+0x4b/0x60 [ 94.400622][ T49] bus_remove_device+0x4bf/0x670 [ 94.405559][ T49] device_del+0xcd5/0x1d10 [ 94.409968][ T49] usb_disable_device+0x567/0x1150 [ 94.415088][ T49] usb_disconnect+0x51e/0xd60 [ 94.419774][ T49] hub_event+0x3fd0/0x72f0 [ 94.424183][ T49] ? rlb_choose_channel+0x1409/0x1d10 [ 94.429549][ T49] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 94.435526][ T49] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 94.441486][ T49] ? led_work+0x720/0x720 [ 94.445798][ T49] ? led_work+0x720/0x720 [ 94.450124][ T49] process_one_work+0x1572/0x1ef0 [ 94.455229][ T49] worker_thread+0x111b/0x2460 [ 94.459986][ T49] kthread+0x4b5/0x4f0 [ 94.464053][ T49] ? process_one_work+0x1ef0/0x1ef0 [ 94.469234][ T49] ? kthread_blkcg+0xf0/0xf0 [ 94.473824][ T49] ret_from_fork+0x35/0x40 [ 94.479463][ T49] Kernel Offset: disabled [ 94.483788][ T49] Rebooting in 86400 seconds..